/Engine/Source/Runtime/RenderCore/Public/CommonRenderResources.h
Vertex shader to draw an instanced quad covering all the viewports (SV_ViewportArrayIndex is output for each SV_InstanceID). Does not have any shader parameters. The pixel shader should just use SV_Position.
class FInstancedScreenVertexShaderVS : public [FScreenVertexShaderVS](API\Runtime\RenderCore\FScreenVertexShaderVS)